Wireless Charging Coil Metal Detection Using Phase Difference
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Solution Overview
Problem
Existing wireless charging systems face challenges in efficiently detecting metal foreign matters due to high data computation and storage requirements, leading to complex hardware and software demands and potential safety hazards from electromagnetic induction.
Innovation Solution
An apparatus and method utilizing a phase-lock control module, excitation module, resonance module, and determining module to detect metal foreign matters by adjusting the frequency of the excitation signal based on phase differences, eliminating the need for frequency sweeping excitation and reducing computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency sweeping excitation is used to detect metal foreign matters, then detection accuracy is improved, but data computation amount and data storage amount increase significantly
Solution Approach 1:
The patent changes the detection parameter from frequency domain analysis (requiring sweeping excitation and FFT) to phase domain analysis. By measuring the phase difference between excitation signal and resonance circuit output signal, the system achieves accurate metal foreign matter detection without needing frequency sweeping, thereby reducing computational complexity while maintaining detection accuracy
Solution Approach 2:
The patent replaces the complex frequency sweeping and FFT analysis system with a simpler phase difference measurement system. Instead of using mechanical frequency modulation and complex data processing, the invention directly measures phase characteristics, substituting a computationally intensive system with a more efficient measurement approach
2Measurement precision
If frequency sweeping excitation is used to detect metal foreign matters, then detection accuracy is improved, but detection time increases
Solution Approach 1:
The patent changes the detection parameter from frequency domain analysis (requiring sweeping excitation and FFT) to phase domain analysis. By measuring the phase difference between excitation signal and resonance circuit output signal, the system achieves accurate metal foreign matter detection without needing frequency sweeping, thereby reducing computational complexity while maintaining detection accuracy
Solution Approach 2:
The patent uses phase-lock control to pre-establish the excitation signal frequency at the resonance frequency of the resonance circuit before detection begins. This preliminary frequency alignment eliminates the need for time-consuming frequency sweeping during actual detection, significantly reducing detection time while maintaining accuracy
3Productivity
If phase-lock control with phase difference measurement is used, then computational requirements are reduced, but control precision must be maintained
Solution Approach 1:
The patent implements phase-lock control where the excitation signal frequency is automatically adjusted based on the phase difference between the excitation signal and the resonance circuit output signal. This feedback mechanism ensures that the system maintains precise frequency alignment with the resonance circuit, achieving both computational efficiency and high control precision simultaneously
Solution Approach 2:
The patent replaces the complex frequency sweeping and FFT analysis system with a simpler phase difference measurement system. Instead of using mechanical frequency modulation and complex data processing, the invention directly measures phase characteristics, substituting a computationally intensive system with a more efficient measurement approach
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the detection process, enhances control precision, and reduces computational requirements, effectively preventing safety hazards by accurately identifying metal foreign matters in wireless charging systems.
Implementation Method 1
a phase-lock control module configured to output a first signal to the excitation module, where the first signal is used to control a frequency of a second signal generated by the excitation module
Implementation Method 2
adjusting the frequency of the excitation signal based on phase differences
Implementation Method 3
energy transmission is performed by using an electromagnetic field or an electromagnetic wave
Implementation Method 4
a resonance module configured to generate a third signal under excitation of the second signal
Implementation Method 5
an eddy current is generated in the metal foreign matter due to electromagnetic induction
Implementation Method 6
an eddy current is generated in the metal foreign matter due to electromagnetic induction
Implementation Method 7
the metal becomes hot, and even the metal may suffer spontaneous combustion
Data Source
AI summary
An apparatus and a method for detecting a metal foreign matter in a wireless charging system, and a device are provided. The apparatus includes a phase-lock control module, an excitation module, a resonance module, a signal collection module, and a determining module. The phase-lock control module is configured to: adjust a frequency of a first signal and output the first signal to the excitation module and the determining module. The excitation module is configured to: generate a second signal based on the first signal, and output the second signal to the resonance module. The resonance module is configured to output the third signal to the signal collection module under excitation of the second signal. The determining module is configured to determine whether there is a metal foreign matter in an area of the target coil.